Chrysler 20 and 30 HP Outboard Motors Service Manual OB 3435, Page 192Get this manual
Installation 1Install upper gear housing to lower gear housing as follows :
AMake sure mating surfaces of gear housings are
clean BPlace gear housing seal in groove on lower gear housing C.lnstall upper housing to lower housing and secure with two (2) nuts and lockwashersTorque to 270 in Ibs(310 kg cm) in steps of 50 in lbs(57 kgem) Figure 43
Figure 42Installing Rear Gear